In the annals of community-board lunacy, it’s hard to top the whining by Manhattan CB 7 over plans for the new Tavern on the Green in Central Park.

As reported by DNAinfo.com, the co-chair of the board’s parks committee didn’t like the design shown last week because — hang on! — the restaurant’s “affordable” takeout section will be reached through a back entrance.

The horrific result, according to CB 7’s Klari Neuwelt: “What’s coming through is the sense that the takeaway [area] is somehow second-class, less desirable.

“That may not be the case. It might not feel that way [to you], but it’s kind of sounding that way.”

This is insanity to anyone who wants to see a new Tavern re-light the black hole that City Hall made of the site a few years ago. It’s a restaurant, not a food court, and there’s no need for takeout service at all. But the city, which laid down a zillion requirements to make Tavern better “harmonize” with the park, chose the winning proposal partly for offering an “affordable” alternative to the dining room.

OK: As The Post’s restaurant critic, I’ve questioned the selection of little-known Emerald Green Group, which runs a tiny Philadelphia eatery, to re-launch 500-seat, multi-faceted Tavern. But anyone who cares about bringing a dormant Central Park landmark back to life can only cheer the new team on.

Yet now Emerald is getting a taste of what “community” input here often means: reckless obstruction in service of tearing down “class” boundaries.

Sure, the local boards can play a constructive role and serve as an invaluable check on developers’ worst impulses. (Too bad they roll over for follies by the Transportation Department and other city agencies.)

But too often the zanies rule. In upper Manhattan, CB 12 fought for 15 years against the FDNY’s proposal to build a desperately needed EMS station in Washington Heights.

It didn’t require tearing down a historic building or displacing residents or businesses: The site was a vacant lot. But the board wanted it used for “affordable” housing — subsidized apartments for the few, including the politically plugged-in, board members’ (and some elected officials’) natural constituency.

Although the EMS station finally opened last month, CB 12 now wants cheap apartments built on top of it — despite the absurdity of having homes in a building where ambulances come and go ’round the clock.

But the Tavern whining sets a new benchmark for ridiculousness. While the city is footing the bill for landscaping and construction, Emerald has its hands full enough having to satisfy 1,001 city agencies as well as make a deal with the same union that scuttled a different company’s previous attempt to reopen Tavern.

Now CB 7 is sounding off on matters where it has no business — even the color of the awning.

In a rational city, the Tavern team would just humor the cranks and get on with what’s already a daunting task.

But while a community board’s role is theoretically advisory only, its “advice” can be costly. Manhattan CB 4’s blessing was essential to winning City Council permission this week for a zoning change needed to construct an architecturally arresting, pyramid-shaped apartment building on West 57th Street. To get the board’s OK, developer Durst Fetner agreed to include “affordable” units in a nearby building (though there’s no legal requirement to do so) and pump $1 million into a community “affordable housing” fund.

Compared with the costs and stakes at that project, CB 7’s grumbling about a rear takeout entrance for Tavern on the Green might sound like a joke. But its new operators, who face so many other challenges, can’t afford to laugh.